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Proceedings Paper

Laser power meters as portable x-ray power monitors
Author(s): Phil Heimann; David Fritz; Jacek Krzywinski; Stefan Moeller; Dennis Nordlund; Alexander Reid; Peter Stefan; Peter Walter; James Welch
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Paper Abstract

For the LCLS-II X-ray instruments, we have developed laser power meters as compact X-ray power monitors. A calibration of the responsivity of the power meters was carried out against a silicon photodiode with synchrotron radiation and a gas monitor detector with FEL X-rays. A manipulator with two power meters was installed in various locations at the LCLS. In the LCLS front end, the power meters were compared with the gas detectors, which are calibrated by the electron energy loss method. The agreement between the power meters and the gas detectors was better than 20% at 1500 eV with the pulse energy measured by the gas detectors higher than that from the power meters. In the AMO instrument, the power meters evaluated the improvement in beamline transmission caused by the oxygen plasma cleaning of the Kirkpatrick-Baez mirrors. Measurements were also conducted one and two years later to observe the effect of further contamination of the optical surfaces. Finally at the SXR instrument, the power meters determined the pulse energy at the sample for a beamtime, where the X-ray intensity was an important parameter.

Paper Details

Date Published: 24 April 2019
PDF: 4 pages
Proc. SPIE 11038, X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation V, 110380R (24 April 2019);
Show Author Affiliations
Phil Heimann, SLAC National Accelerator Lab. (United States)
David Fritz, SLAC National Accelerator Lab. (United States)
Jacek Krzywinski, SLAC National Accelerator Lab. (United States)
Stefan Moeller, SLAC National Accelerator Lab. (United States)
Dennis Nordlund, SLAC National Accelerator Lab. (United States)
Alexander Reid, SLAC National Accelerator Lab. (United States)
Peter Stefan, SLAC National Accelerator Lab. (United States)
Peter Walter, SLAC National Accelerator Lab. (United States)
James Welch, SLAC National Accelerator Lab. (United States)


Published in SPIE Proceedings Vol. 11038:
X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation V
Thomas Tschentscher; Luc Patthey; Kai Tiedtke; Marco Zangrando, Editor(s)

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